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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd63f4e28461ecb0f4eb500139c7d3015f9254ab36daa082aeb7704e58abb9f52' 
  AND token = 'nypTHB/CzKPYoDkpGeEgkrOzdmTIaEf7Vr24DgGe8Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}